Fix bug in export.

Not using ui.print_ was causing encoding error.

pubs/commands/export_cmd.py

@@ -1,18 +1,16 @@
 from __future__ import print_function
-import sys
 
 from .. import repo
 from ..configs import config
 from ..uis import get_ui
 from .. import endecoder
 
+
 def parser(subparsers):
-    parser = subparsers.add_parser('export',
+    parser = subparsers.add_parser('export', help='export bibliography')
-            help='export bibliography')
     # parser.add_argument('-f', '--bib-format', default='bibtex',
     #         help='export format')
-    parser.add_argument('citekeys', nargs='*',
+    parser.add_argument('citekeys', nargs='*', help='one or several citekeys')
-            help='one or several citekeys')
     return parser
 
 
@@ -27,7 +25,7 @@ def command(args):
 
     try:
         papers = [rp.pull_paper(c) for c in args.citekeys]
-    except repo.InvalidReference, v:
+    except repo.InvalidReference as v:
         ui.error(v)
         ui.exit(1)
 
@@ -36,9 +34,6 @@ def command(args):
     bib = {}
     for p in papers:
         bib[p.citekey] = p.bibentry
-    try:
+    exporter = endecoder.EnDecoder()
-        exporter = endecoder.EnDecoder()
+    bibdata_raw = exporter.encode_bibdata(bib)
-        bibdata_raw = exporter.encode_bibdata(bib)
+    ui.print_(bibdata_raw)
-        print(bibdata_raw, end='')
-    except KeyError:
-        ui.error("Invalid output format: %s." % bib_format)